Science Atomic structre

Question 1

pink on periodic table

Answer 1

metals

Question 2

blue on periodic table

Answer 2

non metals

Question 3

atomic number

Answer 3

number of protons and electrons

Question 4

how to find the number of neutrons

Answer 4

atomic mass-number of protons

Question 5

what are the rows

Answer 5

number of shells

Question 6

what are the colums

Answer 6

valence electrons

Question 7

what is the exception for colums of valence electrons

Answer 7

helium it has 2 valence electrons

Question 8

valence electrons in metals

Answer 8

3 or less

Question 9

valence electrons in non metals

Answer 9

5 or more

Question 10

do metals gain or lose

Answer 10

lose

Question 11

do non metals gain or lose

Answer 11

gain

Question 12

when are atoms most stable

Answer 12

when their valence shell is full

Question 13

are atoms able to gain or lose electrons

Answer 13

yes

Question 14

what is an isotope

Answer 14

a version of an element with diff numbers of neutrons and mass

Question 15

isotopes have

Answer 15

the same number of protons as the original element

Question 16

how do u find the number of neutrons in an isotope

Answer 16

use the mass in the name of the isotope and minus the protons from that

Question 17

using carbon 13 isotope how do u write the name and symbol

Answer 17

carbon-13 13c

Question 18

what is an ion

Answer 18

when it gains or loses electrons to become stable

Question 19

when an atom loses an electron

Answer 19

it becomes positive

Question 20

when an atom gains an electron

Answer 20

it becomes negative

Question 21

ion symbol

Answer 21

element symbol, charge, then number of electrons it gains or loses

Question 22

what are cations

Answer 22

positive charge, when an itom loses electrons, add ion to name of the element

Question 23

what are anions

Answer 23

negative charge, when an atom gains electrons, add ide to name of the element

Question 24

what are the four major models pf the atom

Answer 24

billiard ball, plum pudding, nuclear model, planetary model

Question 25

billiard ball

Answer 25

Dalton, right- atoms of different elements have different masses Atoms are tiny, particles that make up all matter. wrong- Atoms are indivisible atoms of the same element are identical

Question 26

plum pudding

Answer 26

thomson, discovered electrons using the cathode ray experiement right- atoms have negative particles atoms are divisible into smaller parts wrong- atoms have no empty space no nucleus

Question 27

nuclear model

Answer 27

rutherford, discovered the nucleus through the gold foil experiement right- atoms have a nucleus most of the atom is empty space wrong- electrons orbit like planets(they would hit the nucleus no neutrons

Question 28

bohr model model

Answer 28

bohr, right- electrons orbit nucleus is small dense and postive wrong- electrons move in perfect circles does not work for complex fractions

Question 29

cathode ray tube experiment importance

Answer 29

(found electrons)its important because it showed electrons are negative and it proved that atoms are not indivisible, they are made particles. Which changed how scientists understood matter

Question 30

gold foil experiment importance

Answer 30

it is important because it showed that atoms have a postive dense nucleus, and the rest is mostly empty space. Which transformed atomic science because it helped understand how the atom works.

Question 31

gold foil

Answer 31

they shot tiny positive particles at a thin sheet of gold foil they expected all the particles to pass straight through but some bounced off or back

Question 32

cathode ray tube

Answer 32

he had a glass tube with a little bit of gas, he passed electricity thru the tube and a glowing beam appeared, he put metal (one postive one neg) to see how the beam moved the beam bent towards the postive plate the beam was negative